DE102010053110A1 - Hybrid braking system - Google Patents

Abstract

A hybrid brake system is disclosed that is equipped with a pedal simulator that has a parallel structure. The hybrid brake system includes an input shaft connected to a brake pedal, a pedal simulator provided therein with a control piston connected to the input shaft, a master cylinder communicating with the pedal simulator and provided with first and second pistons therein Oil supply part that supplies oil to the pedal simulator and the master cylinder, and a reinforcing part that communicates with the pedal simulator and forms a recoil force when the brake pedal is stepped on.

Description

BACKGROUND

1. Technical area

The disclosure relates to a hybrid brake system, and more particularly relates to a hybrid brake system capable of improving a brake pedal feel through the use of a pedal simulator having a parallel structure.

2. Description of the Related Art

In general, when a driver steps on a brake pedal, a hydraulic active booster (HAV) detects displacement of the brake pedal from a pedal travel sensor and closes a shut-off valve to close a fluid path between a master cylinder of a pedal simulator and a wheel, and An electronic control unit (ECU) calculates the wheel pressure according to a pressure signal of a pressure sensor to control the pressure of each wheel by an independent feedback control.

If the HAV fails or fails, then the shut-off valve is switched to a normally open (NO) state so that a fluid pressure of the master cylinder corresponding to a pedal force of the driver is transmitted to a wheel cylinder, so that in case of system failure, the minimum braking operation is performed can be.

In such a HAV, when the driver steps on the brake pedal, an input shaft is moved, and the ECU detects the movement of the input shaft, so that a fluid stored in a memory is transmitted to the master cylinder to control the fluid pressure in to produce the master cylinder. But if the pressure of the master cylinder is changed during the regenerative braking operation, then the pressure variation may be transmitted to the brake pedal, thereby deteriorating the pedal feel.

SHORT SUMMARY

Accordingly, it is an aspect of the disclosure to provide a hybrid brake system equipped with a pedal simulator having a parallel structure and capable of improving the brake pedal feeling.

Additional aspects and / or advantages of the disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

The above and / or other aspects of the disclosure are achieved by providing a hybrid braking system. The hybrid brake system includes an input shaft connected to a brake pedal, a pedal simulator provided therein with a spool connected to the input shaft, a master cylinder communicating with the pedal simulator and provided therein with first and second pistons An oil supply member for supplying oil to the pedal simulator and the master cylinder, and a reinforcing member that communicates with the pedal simulator and forms a repulsive force when pressure is applied to the brake pedal.

The pedal simulator includes a simulator housing having a chamber for receiving the control piston, the reinforcing member being provided at a lower portion of the simulator housing and having a parallel structure.

The reinforcing member includes a cylinder that communicates with the pedal cylinder, a spring plate that slides up or down in the cylinder, a compression spring that is compressed by the spring plate, and a housing cap that supports the compression spring.

The simulator housing is provided therein with a first oil passage for supplying oil into the cylinder.

The master cylinder includes a second oil passage for supplying oil to a space between the second piston and an inner surface of the master cylinder.

The second piston is a booster piston for moving the first piston while advancing by oil received therein through the second oil passage.

The first piston has a recess portion recessed inwardly from a rear end of the first piston, a front end portion of the control piston is inserted into the recess portion, and a gap is formed between the recess portion and the control piston.

As described above, in accordance with the hybrid brake system of the disclosure, a hydraulic pressure from the pedal simulator having a parallel structure can be independently controlled, so that the brake pedal feeling can be improved.

Since the pedal simulator is installed separately from the housing, the pedal simulator is free can be designed and adjusted easily.

BRIEF DESCRIPTION OF THE DRAWINGS

These and / or other aspects will become apparent and more readily apparent from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

1 FIG. 12 is a schematic perspective view showing a hybrid brake system in accordance with the disclosure; FIG.

2 FIG. 12 is a schematic sectional view showing the hybrid brake system in accordance with the disclosure; FIG.

3 a partial sectional view of 2 is; and

4 FIG. 12 is a schematic view showing the operation of the hybrid brake system in accordance with the disclosure. FIG.

DETAILED DESCRIPTION

Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same elements throughout. The embodiments will be described below to explain the disclosure by referring to the figures.

As in 1 and 2 shown comprises a hybrid brake system 1 in accordance with the disclosure, a brake pedal 10 , which is operated by a driver when braking, an input shaft 11 that with the brake pedal 10 connected, a pedal simulator 20 , which provides a recoil force against the brake pedal 10 providing a master cylinder 30 that with the pedal simulator 20 is connected to transmit a brake pressure to a wheel brake (not shown) when the brake pressure from the brake pedal 10 is generated, an oil container 40 that stores oil and an oil supply part 50 containing the oil of the oil container 40 the master cylinder 30 and the pedal simulator 20 supplies.

The input shaft 11 is with the brake pedal 10 connected and is in a rear end of a control piston 21 introduced, which will be described later, so that the control piston 21 on the direction of the input shaft 11 out in a simulator housing 20a can be moved.

The master cylinder 30 includes a cylinder housing 31 having a space to store oil therein and an oil tank 40 is with the upper section of the cylinder housing 31 coupled.

An end surface of the cylinder housing 31 is open and is with the pedal simulator 20 coupled, which will be described later.

The cylinder housing 31 of the master cylinder 30 includes a second piston 33 into the control piston 21 is introduced, a first piston 32 which is displaceable by the second piston 33 is provided, and an elastic spring 34 between an inner wall of the cylinder housing 31 and the first piston 32 is arranged to the cylinder housing 31 and the first piston 31 elastic support.

A second oil passage opening 35 is at an upper portion of the master cylinder 30 provided to oil in the first chamber 36 between the second piston 33 and the inner surface of the master cylinder 30 supply.

The second piston 33 is in a front end section 21a of the control piston 21 introduced, and a sealing element 33b is between the second piston 33 and the control piston 21 provided.

A recess part 32a is inwardly directed from an end portion of the first piston 32 formed, and a gap G is between the recess part 32a and the front end portion 21a of the control piston 21 educated.

During normal operation, a force is applied by the input shaft 11 is applied, with the brake pedal 10 is connected, due to the gap G not to the control piston 21 and the first piston 32 transfer.

In other words, in the case of regenerative braking, even if the first piston becomes 32 Regarded in reverse, the pedal feel of the brake pedal 10 not deteriorated because of the spool 21 not in direct contact with the first piston 32 comes.

sealing 33a and 21b are at an outer portion of the control piston 21 provided to the gap with the first piston 32 and the gap with the inner side surface of the simulator housing 20a seal.

The pedal simulator 20 includes the simulator housing 20a connected to the open end of the cylinder housing 31 coupled, and a second chamber 23 is in the simulator housing 20a formed, in which the control piston 21 sliding into it.

A first oil passage opening 22 is at an upper portion of the simulator housing 20a formed to remove oil from the oil supply part 50 to the second chamber 23 to deliver.

A reinforcing part 25 having a parallel structure is at a lower portion of the simulator housing 20a provided.

The reinforcing part 25 is on one side of it with a first reinforcing part 25a and is on an opposite side thereof with a second reinforcing part 25b provided, wherein the first and second reinforcing parts 25a and 25b are provided parallel to each other. A pressure control is provided by the first and second reinforcing parts 25a and 25b achieved independently, so that a braking force can be controlled independently.

The first reinforcing part 25a includes a cylinder 25a ' that with the second chamber 23 of the simulator housing 20a communicates, a spring plate 26 in the cylinder 25a ' can be moved up or down, a compression spring 27 that of the spring plate 26 is compressed, and a housing cap 28 holding the spring plate 26 supported.

A third chamber 25 '' is inside the cylinder 25a ' formed, that is in a space between an upper surface of the inside of the cylinder 25a ' and the upper end of the spring plate 26 , and oil passing through the first oil passage 22 is introduced, becomes the third chamber 25 '' through the second chamber 23 fed.

The oil supply part 50 includes an engine M controlled by an ECU (electronic control unit) (not shown), a pump operated by the engine M, and a reservoir for temporarily storing high pressure oil generated by the pump.

The engine M is controlled by the ECU (not shown), and the ECU adjusts a pressure according to the pedal force of a driver according to the pressure level of the brake pedal 10 that of the pedal travel sensor 51 was determined by controlling the motor M.

A pressure sensor (not shown) is provided at an outlet of the accumulator to measure the oil pressure of the accumulator so that the oil pressure measured by the pressure sensor is compared with the predetermined pressure. If the measured oil pressure is lower than the predetermined pressure, then the pump is driven so that the reservoir can be filled with oil.

In addition, the ECU transfers oil that has been filled in the memory into the first to third chambers 36 . 23 and 25b through the first and second oil passage openings 22 and 25 to form a hydraulic pressure corresponding to the pedal force of the driver.

As in 3 and 4 is shown, the spring plate moves 26 inside the cylinder 25 ' by oil up or down, that of the Ölzufuhrtei 50 during normal operation through the first oil passage opening 22 is supplied.

The spring plate 26 includes a body 26 ' which has a cylindrical shape, a flange part 26 '' attached to an upper section of the body 26 ' is provided, and a guide groove 26 '' starting from a lower end of the spring plate 26 recessed inward.

sealing 29 are between the upper section of the spring plate 26 and the cylinder 25 ' provided.

The body 26 ' of the spring plate 26 has an inner diameter smaller than that of the cylinder 25 ' is, and the flange part 26 '' has a size corresponding to the inner diameter of the cylinder 25 ' corresponds to the compression spring 27 support.

The housing cap 28 is at an open lower end of the cylinder 25 ' provided. The housing cap 28 includes a support member 28 '' having a diameter corresponding to an inner diameter of the cylinder 25 ' corresponds, and a guide 28 ' extending from the central portion of the support member 28 '' projects upwards and into a guide groove 26 '' of the spring plate 26 is introduced.

The compression spring 27 is at a rear end of the cylinder 25 ' installed and is between the support part 28 '' the housing cap 28 and the flange part 26a '' of the spring plate 26 placed.

The spring constant, the effective area and the bearing load of the compression spring 27 are variable.

Accordingly, oil passing through the first oil passage opening 22 of the simulator housing 20a is fed into the third chamber 25 '' through the second chamber 23 introduced, and the spring plate 26 is due to the oil that enters the third chamber 25 '' is introduced, moved down.

When the compression spring 27 by the movement of the spring plate 26 is compressed, the compression spring points 27 a repulsive force, so that the driver can have a brake pedal feel.

In this case, as the reinforcing part 25 the first and second reinforcing parts 25a and 25b includes, which are installed in parallel with each other, a pressure to be supplied to each chamber independently, so that the braking force can be controlled independently.

Because the first and second reinforcing parts 25a and 25b have the same structure and the same operation, the details thereof are omitted.

Although a few embodiments have been shown and described, it will be apparent to those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the disclosure, the scope of which is defined in the claims and their equivalents is.

Claims (7)

A hybrid braking system comprising: an input shaft connected to a brake pedal; a pedal simulator provided therein with a control piston connected to the input shaft; a master cylinder that communicates with the pedal simulator and is provided therein with first and second pistons; an oil supply part for supplying oil to the pedal simulator and the master cylinder; and a reinforcing member that communicates with the pedal simulator and generates a repulsive force when pressure is applied to the brake pedal. The hybrid brake system of claim 1, wherein the pedal simulator includes a simulator housing having a chamber for receiving the control piston, and the reinforcing member is provided at a lower portion of the simulator housing and has a parallel structure. A hybrid brake system according to claim 1, wherein the reinforcing member comprises a cylinder communicating with the pedal cylinder, a spring plate which slides up or down in the cylinder, a compression spring compressed by the spring plate, and a housing cap including the compression spring supported. A hybrid brake system according to claim 2, wherein the simulator housing is provided therein with a first oil passage for supplying oil into the cylinder. The hybrid brake system according to claim 1, wherein the master cylinder includes a second oil passage for supplying oil to a space between the second piston and an inner surface of the master cylinder. The hybrid brake system of claim 5, wherein the second piston is an intensifier piston to move the first piston while moving forward by oil received therein through the second oil passage. The hybrid brake system according to claim 1, wherein the first piston has a recess portion recessed inwardly from a rear end of the first piston, a front end portion of the control piston is inserted into the recess portion, and a gap is formed between the recess portion and the control piston.

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